CI: check multiple php versions for more compatibility #1263

Job	Run time
Detecting E2E Test Categories	33s
Test (general)	20m 52s
Test (advanced-label-1)	11m 33s
Test (advanced-label-2)	10m 23s
Test (advanced-label-3)	8m 19s
Test (advanced-label-4)	3m 27s
Test (advanced-label-5)	13m 23s
Test (blocks)	6m 19s
Test (blocks-home-link)	3m 51s
Test (blocks-navigation-link)	3m 10s
Test (blocks-navigation-submenu)	3m 7s
Test (bootstrap)	3m 6s
Test (build)	4m 32s
Test (compatibility)	20m 51s
Test (inner-blocks)	20m 49s
Test (inner-blocks-compatibility)	5m 35s
Test (panels)	4m 21s
Test (panels.build)	4m 29s
Test (plugins)	3m 34s
Test (woocommerce)	3m 20s
	2h 35m 34s

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